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Re: MatrixMixer info
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Re: MatrixMixer info

I'll edit down to the interesting bits...

On Nov 17, 2003, at 3:17 PM, James McCartney wrote:

This cannot be an effect - it must be a signal generator like a music device or audio file.

I'm not sure why you say this. The MatrixMixer doesn't know what is upstream as long as the input is not returning an error, whatever you connect should be OK.

It's just what I observed. I've got subgraphs feeding into the mixer and the only time I could get it to produce noise was when I had signal generators attached to each input bus. Having a music device connected to input 0 and an effect connected to input 1 meant that no sound was emitted. Disabling input 1 or connecting another music device to the effect made it work... I agree it's weird.


2. If the channel layout of the input audio unit does not match the mixer input bus then the MatrixMixer will not accept input. Use kAudioUnitProperty_StreamFormat to fix them up.

I wouldn't use the words "channel layout" here. To us, channel layout means the number and order of the channels (viz AudioChannelLayout). That matrix mixer only cares about the number.

You're right - my mistake - I'll correct the page.



Not my terminology preference.. 0xFFFFFFFF is the master. These are output channel gains.

I wasn't thinking big enough - (too focused on my little app) - of course if you've got multi-outs you'd want one fader to control them all... I'll correct this too.

james mccartney
apple coreaudio


Thanks for reviewing it! :-)

Robert.
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References: 
 >MatrixMixer info (From: Robert Grant <email@hidden>)
 >Re: MatrixMixer info (From: James McCartney <email@hidden>)



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